--- a/tool/Command.cpp	Wed Aug 13 13:20:48 2008 +0000
+++ b/tool/Command.cpp	Wed Aug 13 13:22:42 2008 +0000
@@ -119,7 +119,7 @@
 {
     stringstream err;
 
-    err << "The slave selection matches " << size << "slaves. '"
+    err << "The slave selection matches " << size << " slaves. '"
         << name << "' requires a single slave.";
 
     throwInvalidUsageException(err);